Exhaust-control mechanism for gas-engines.



'NO. 874,974. PATENTEDDE 31 1907,

y B. 0. MADDOX. I EXHAUST CONTROL MECHANISM FOR GAS ENGINES.

APPLICATION FILED AUG. 26, 1907.

wuc nlfor v UNITED [PA ENT oFFIoE.

ERNEST o. MADDOXQoF wooDwAED, OKLAHOMA, ASSIGNOR or ONE-HALF 'ro cnAaL s A. noors, or-woonwann, OKLAHOMA.

EXHAUST-GONTROL imcmmsm FOR GAS-ENGINES.

Specification of Letters Patent- Patented Dec. 31, 1907 Application filed Aughit 26.1907. Serial N8. 390,196.

To all whom it may concern: 7

Be it known that I, EENEsT C. MADDOX, a citizen of the United. States, residing at Woodward, in the coimty of Woodward and State of Oklahoma, havejnventeda new and useful Exhaust-Control Mechanism for Gas- Engines, of which the following is a specification. a This invention relates to traction engines, v and other vehicles in which internal combustion engines are employed for motor power.

The principal object of the inventlon is to provide an improved means for manually controlling the speed of the engine where the 1,5 vehicle is crossing ditches or other obstructions in the road to the end that the speed may be lowered very quickly without the necessity of waiting for the action of the govrnor, and without cutting oil or reducing the. load through the feed pipe leading from the'arbureter. I v 4 A further object of the invention is to provide a device in the mat one of an attachment proportions, sizeand minor details of the structure may be made without departing from the spirit or sacrificing anyof the advanta eso the invention;

In t e accompanying drawings:fFigure 1.

is an elevation of aportion of a gas en ine illustrating the improved exhaust control ing I dexgicehpplied-"thereto; Fig. 2 is a pers ec- Jive view of the ,controlling device detac ed.

{#15 \Similar numerals of reference are employed to 1 indicate corresponding arts throughout the several figures of the rawin s.

in the -engine shown,. the exhaust valve a '50 is' carried by a stem 6 that is normally held in closed'position by a" spring 0. The valve stem' ii, engaged b "a tappet arm (1 which is l tkbted on a stan ard e projecting from the heated by a rod f to the cam or. other device by which the exhaust valve is opened at regu .lar intervals to permit the dischar e of the products of combustion from the cy inder. In carryin out the present invention provision is ma e for engagingthe' tappet arm d when the latter has been moved to exhaust valve opening position and holding the tappet wit the exhaust-valve open in order to reduce the s eed.

The attac ment comprises a yoke shaped bracket 10 provided at one end with an open- 1 ing 11, and at the opposite end with a slot 12, this being arranged for the reception of bolts which are tapped in the carbureter connection, or at any other suitable point. atthe explosion chamber end of the cylinder. Pivoted to the central portion of the bracket 10 is a lever 15 having an operatin handlelo and provided with a locking shou der 17 that preferably is arranged ona curved line struck from the center of the pivotal connection 11. Extending from the upper end of the bracket is an arm 18 which is connected by a helical tension spring '19 to the lever 15, this position. The lower face of the lever is ar-. ranged on a slightly concaved line'termina tingat the locking shoulder 17, and the lever is so positioned with respect to the tappet d that the forward edge of said' tappet will move to a point-beyond the vertical plane of the-shoulder 17 each time the exhaust valve is moved to open position, and as the lever is normally elevated the tappet arm will not be 'en aged and held by said lever.

hen the machine is crossing a ditch or meets an obstruction where it is desirable to quickly reduce. the speed, the operator presses down on the lever and at the next movement of the tappet to valve openingposi tion, ithe tappet will be engaged by the shoulder 17 and will be held with the valve in open position, so that the speed will be uickly reduced. As soon as the ressure on t e lever is released, thespring elevates the gine then operates in the usual manner.

It is obvious that where the construction and arrangement of the engine is not such as to .render it convenient for the operator to stand directly at the explosion chamber, the

spring normally holding the lever in elevated lever to its normal idle position and the en head of the cylinder, the tappet being con means toe hand lever or foot lever within convenient reach of the operator.

I 012mm "AnjnterhaliiombuStion engine incinding anexhaust valve, an exhaust valve stem, a

' 'tappetarm. for engaging the stem, a bracket secured to a stationary portion'of the engine,

- v taplpet, and provided with e; concavedlower sur an arm projecting from the br ecket, a lever pivoted to the bracket at a point above the ace and with a locking shoulder curyed on an arc struck from-the center of movement of the lever, and a spring connecting the lever to the arm 'and serving to hold said lever 1'5 normally inactive.

In testimony that'l claim the foregoing as my own; l have hereto affixed my signature in thepresence of two Witnesses. ERNEST o; MADDOX; r I Witnesses:

J. A. GARDNER, C. C. MANSO. 

